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Make GetCachedPower test more precise

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This commit is contained in:
Victor Zverovich
2020-10-04 07:20:22 -07:00
committed by Victor Zverovich
parent a581e9e5d8
commit af8a180aed
2 changed files with 45 additions and 17 deletions
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test/format-impl-test.cc
+30 -5
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@@ -212,14 +212,39 @@ TEST(FPTest, Multiply) {
}
TEST(FPTest, GetCachedPower) {
typedef std::numeric_limits<double> limits;
using limits = std::numeric_limits<double>;
for (auto exp = limits::min_exponent; exp <= limits::max_exponent; ++exp) {
int dec_exp = 0;
auto fp = fmt::detail::get_cached_power(exp, dec_exp);
EXPECT_LE(exp, fp.e);
int dec_exp_step = 8;
EXPECT_LE(fp.e, exp + dec_exp_step * log2(10));
EXPECT_DOUBLE_EQ(pow(10, dec_exp), ldexp(static_cast<double>(fp.f), fp.e));
bigint exact, cache(fp.f);
if (dec_exp >= 0) {
exact.assign_pow10(dec_exp);
if (fp.e <= 0)
exact <<= -fp.e;
else
cache <<= fp.e;
exact.align(cache);
cache.align(exact);
auto exact_str = fmt::format("{}", exact);
auto cache_str = fmt::format("{}", cache);
EXPECT_EQ(exact_str.size(), cache_str.size());
EXPECT_EQ(exact_str.substr(0, 15), cache_str.substr(0, 15));
int diff = cache_str[15] - exact_str[15];
if (diff == 1)
EXPECT_GT(exact_str[16], '8');
else
EXPECT_EQ(diff, 0);
} else {
cache.assign_pow10(-dec_exp);
cache *= fp.f + 1; // Inexact check.
exact.assign(1);
exact <<= -fp.e;
exact.align(cache);
auto exact_str = fmt::format("{}", exact);
auto cache_str = fmt::format("{}", cache);
EXPECT_EQ(exact_str.size(), cache_str.size());
EXPECT_EQ(exact_str.substr(0, 16), cache_str.substr(0, 16));
}
}
}